Therapeutic compositions and method

ABSTRACT

WHEREIN R is selected from the group consisting of -(CH2)x-CN where x is an integer from 0 to 3, COOH and COOR&#39;&#39; where R&#39;&#39; is alkyl of one to four carbon atoms: R1 is selected from the group consisting of hydrogen, alkoxy and alkylthio of one to four carbon atoms, -CN and alkenyl and alkynyl of two to four carbon atoms and R2 is selected from the group consisting of hydrogen, halogen and alkyl and alkoxy of one to four carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers and a major amount of a pharmaceutical carrier and a method of producing bradycardia and suppressing tachycardia effects of N-isopropyl-noradrenaline in warm-blooded animals.   A composition having bradycardia and iisoproterenol antagonistic activity comprising at least one compound selected from the group consisting of racemates of 1-phenoxy-2-hydroxy-3-tert.-butylamino propanes of the formula

United States Patent [1 1 Koppe et a1.

[4 1 Feb. 25, 1975 [22] Filed: Oct. 23, 1973 [21] Appl. No.: 408,743

Related U.S. Application Data [60] Division of Ser. No. 294,226, Oct. 2, 1972, which is a division of Ser. No. 36,676, May 12, 1970, Pat. No.

3,740,444, which is a continuation-in-part of Ser. No. 700,376, Jan. 25, 1968, Pat. No. 3,541,130.

[30] Foreign Application Priority Data July 25, 1967 Germany 93645 June 15. 1967 Great Britain 27645/67 Feb. 6, 1967 Germany 91070 June 15. 1967 Germany 93025 [52] U.S. Cl 424/304, 424/309, 424/317 [51] Int. Cl A6lk 27/00 [58] Field of Search 424/304 [56] References Cited FOREIGN PATENTS OR APPLICATIONS 1,126,165 7/1956 France 6,409,883 3/1965 Netherlands Primary Examiner-Stanley J. Friedman Attorney, Agent, or Firm-I-Iammond & Littell [57] ABSTRACT A composition having bradycardia and iisoproterenol antagonistic activity comprising at least one compound selected from the group consisting of racemates of 1-phenoxy-2-hydroxy-3-tert.-butylamino propanes of the formula R2 7 r I wherein R is selected from the group consisting of (CH )),-CI-l where x is an integer from 0 to 3, COOH and COOR' where R is alkyl of one to four carbon atoms: R is selected from the group consisting of hydrogen, alkoxy and alkylthio of one to four carbon atoms, CN and alkenyl and alkynyl of two to four carbon atoms and R is selected from the group consisting of hydrogen, halogen and alkyl and alkoxy of one to four carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers and a major amount of a pharmaceutical carrier and a method of producing bradycardia and suppressing tachycardia effects of N-isopropylnoradrenaline in warm-blooded animals.

13 Claims, No Drawings THERAPEUTIC COMPOSITIONS AND METHOD PRIOR APPLICATION This application is a division of our copending application Ser. No. 294,226 filed Oct. 2, 1972 which in turn is a divisional application of our copending application Ser. No. 36,676 filed May I2, 1970 and now U.S. Pat. No. 3,740,444 which in turn is a continuationin-part application of our copending commonly as signed U.S. Pat. application Ser. No. 700,376 filed Jan. 25, 1968, now U.S. Pat. No. 3,541,130.

OBJECTS OF THE INVENTION It is an object of the invention to provide novel compositions having bradycardia and isoproterenol activity.

It is another object of the invention to provide novel method of inducing bradycardia and isoproterenolantagonistic activity in warm-blooded animals.

These and other objects and advantages of the invention will become obvious from the following detailed description.

THE INVENTION The novel compositions of the invention having bradycardia and isoporterenol antagonistic activity are comprised of at least one compound selected from the group consisting of racemates of l-phenoxy-Z-hydroxy- 3-tert.-butylam ino propanes of the formula wherein R is selected from the group consisting of ((H- )J-(N and (CH2)..--NH2 where x is an integer from to 3. (OOH and (OOR where R is alkyl of one to four carbon atoms: R. is selected from the group consisting of hydrogen. alkoxy and alkylthio of one to four carbon atoms, -CN and alkenyl and alkynyl of two to four carbon atoms and R is selected from the group consisting of hydrogen. halogen and alkyl and alkoxy of one to four carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers and a major amount of a pharmaceuti- Method A By reacting an epoxide of the formula -0CII-CIICII2 n l 0 lI-i (ll) where the Rs have the same meanings as in formula I, with tert.-butylamine in the presence of an inert organic solvent, such as ethanol. Method B By reacting a l-substituted phenoxy-2-hydroxy-3- halo propane of the formula wherein the Rs have the same meanings as in formula I and Hal is halogen, with tert.-butylamine in the presence of an inert organic solvent, such as ethanol.

The starting compounds of the formula II to III for the above methods are known compounds or may readily be prepared by known methods. For example,

the substituted l-phenoxy-2,3-epoxy propanes of formula II may be prepared by reacting a corresponding substituted phenolate under alkaline conditions with a l-halo-2,3-epoxy propane such as epichlorohydrin. Most of the corresponding phenols are known in the prior art and they are easily obtainable by conventional methods. Cyanophenols, particularly those with alkyl and/or alkoxy groups, may be prepared by splitting off water from the correspondingly substituted phenolic benzaldoximes which are prepared from known phenolic benzaldehydes. Cyanophenols with an allyl substituents are obtained by reacting the cyanophenol with allyl bromide with rearrangement of the intermediate allyl ether into the final product. Halocyanophenols are obtained by reacting the cyanophenol with a hydrogen halide in the presence of H 0 Cyanomethylphenols can be made by introducing a nitro group into a benzylnitrilc and converting it into a phenol group by reducing. diazotizing and boiling down. The aminoalkyl substituted compounds of formula I are prepared by reduction of the corresponding cyano or cyanoalkyl substituted compounds, which in turn can be obtained by method A.

The amino-substituted compounds of formula I are prepared by reacting the corresponding nitrophenols with epichlorohydrin to form the corresponding 2,3- epoxy compound which is reacted with ten.- butylamine and then the nitro group is reduced to the amino group. Other processes are described in Belgian Pat. No. 641,133 and in the literature.

The free bases of formula I obtained by any of the above methods may subsequently be transformed into their nontoxic, pharmacologically acceptable acid addition salts by conventional methods, that is, by acidifying a solution of the free base with the desired acid and recovering the acid addition salt by evaportion of the solvent or by precipitation, for instance.

The compounds of the formula I possess on the CHOH grouping an asymmetric C-atom, and consequently, occur in the form of racemates as well as in the form of optically active antipodes.

The optically active compounds can be obtained in that one proceeds either from optically active starting compounds or that the racemates obtained are split into their optical antipodes in the usual manner, for example, by means of dibenzoyl-D-tartaric acid or D-3-bromocamphor-8-sulfonic acid or di-p-toloyl-dtartaric acid.

The said compositions of the invention produce bradycardia and at the same time act as N-isopropylnoradrenaline (lsoproterenol) antagonists as shown in dogs and guinea pigs. Thus, the tachycardiac effects caused by the administration of N-isopropyl-noradrenaline are suppressed or eliminated by prior administration of one of the compositions of the present invention, and cardiac arrhythmia are equalized by them. In other words, the compositions of the invention block the sympathetic nervous system of the heart. Consequently, the areas of indication for the compositions, of the present invention are hypertension, angina pectoris, cardiac arrhythmia, digitalis intoxication and pheochromocytoma disorders. They may also be used in conjuction with coronary dilator or sympathicomimetic agents. The compositions may be in the form ofinjectable solutions or suspensions, tablets, dragees, sustained release tablets, etc. The usual does is 1 to 300 mg, preferably 1 to 150 mg, for oral administration and 1 to 20 mg for parental administration.

The novel method of the invention of inducing bradycardia and of suppressing tachycardiac effects'of N-isopropylnoradrenaline in warm-blooded animals comprises administering to warm-blooded animals a safe and effective amount of at least one of the compounds of formula I. The said compounds may be administered orally, parentally or rectally. The usual dosage is 0.002 to mg/kg, depending upon the method of administration.

In the following examples there are described several preferred embodiments to illustrate the invention. However, it should be understood that the invention is not intended to be limited to the specific embodiments.

EXAMPLE I Preparation of 1-(2-cyano-3-methyl-phenoxy)-2- hydroxy-3-tert.-butylamino propane HCl 1-(2-cyano-3-methyl-phenoxy)-2,3-epoxy propane, prepared from 17 gm (0.128 mol) of 2-cyano-3- methylphenol and 12.2 gm (0.132 mol) ofepichlorohydrin in 125 ml of l N NaOH, was dissolved as a dark, impure viscous oil in 200 ml of methanol, and 29 ml of tert.-butylamine were added thereto. After refluxing the mixture for 2 hours, the solvent was distilled off under vacuum, and the brown residue was extracted with dilute HCl. The clear solution was filtered over charcoal and was made alkaline with NaOH. The precipitating base was taken up in ether and the organic phase was separated and was washed repeatedly with water and dried over MgSO After concentration up to weight constancy, 4.5 gm of a base remained and this was dissolved in a small amount of ethanol. The hydrochloride salt was precipitated by an addition of ethereal HCl and was isolated as a solid product. It was recrystallized from acetonitrile with an addition of ether followed by a second recrystallization from ethanol with an addition of ether to obtain l-(2-cyano-3-methylphenoxy)-2-hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 178 -l80 C. Using this same procedure, there was obtained l-(2- cyanomethyl-3-methyl-phenoxy)-2-hydroxy-3-tert.- butylamino-propane hydrochloride.

EXAMPLE [I Preparation of l-( 2-cyano-4-chlorophenoxy)-2- hydroxy-3-tert.-butylamino propane. HCl

5.7 gm (0.02 mol) of l-(2-cyanophenoxy)-2- hydroxy-3-tert.-butylamino propane (prepared analogous to Example I) were dissolved in 32 ml of concentrated HCl and while stirring at 45 C, 2.27 gm of 35 percent hydrogen peroxide were added dropwise so that the temperature did not exceed 65 C. Thereafter, the temperature was maintained at 60 C for 30 minutes and the mixture was concentrated in vacuo at the end of which a solid residue remained. The raw hydrochloride was recrystallized from ethanol under an addition of ether to obtain 3 gm of 1-(2-cyano-4- chlorophenoxy)-2-hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 180 -182 C.

EXAMPLE Ill Preparation of 1-( 2-methyl-4-cyanophenoxy)-2- hydroxy-3-tert.-butylamino propane. HCl

24 gm of 1-(2-methyl-4-cyanophenoxy)-2,3-epoxypropane in 150 ml of ethanol were reacted with 25 ml of tert.-butylamine. After refluxing the reaction mixture for 2 hours, the solvent was distilled off in vacuo, and the residue was dissolved in dilute HCl. After extraction with ether, the aqueous phase was made alkaline with NaOH and the precipitated base was taken up in ether. The ether solution was washed with H O, dried over MgSO and finally the ether was distilled off. The residue was dissolved in ml of ethanol and ethereal HCl was added thereto. The precipitating crystalline hydrochloride was isolated and recrystallized from methanol with an addition of ether to obtain 17 gm ofpure l-(2-methyl-4-cyanophenoxy)2-hydroxy-3- tert.-butylamino propane hydrochloride having a melting point of 230 -231 C.

EXAMPLE IV Preparation of 1-(2-methoxy-4-cyanophenoxy)-2- hydroxy-3-tert.-butylamino propane. HCl

9.9 gm (0.048 mol) of l-(2-methoxy-4-cyanophenoxy)-2,3-epoxy propane in 100 ml of ethanol were heated with 14.6 gm (0.02 mol; 21 ml) of tert.- butylamine for 3 hours over a water bath. After distillation of the solution in vacuo, the residue was digested with dilute HCl and the solution was separated from the insoluble matter. The aqueous phase was made alkaline with NaOH and the precipitated base was extracted with ether, washed with water, and the organic phase was dried over MgSO After distilling off the ether, the oily residue was dissolved in ethanol, admixed with ethereal HCl, and the precipitating crystals of l-(2- methoxy-4-cyanophenoxy) -2-hydroxy-3-tert.- butylamino propane hydrochloride were vacuum filtered and recrystallized from ethanol with an addition of ether to obtain 7.1 gm of the product having a melting point of 210 213 C.

EXAMPLE V Preparation of l-(2-aminomethy1-4-chlorophenoxy)-2- hydroxy-3-tert.-butylamino propane. 2 HCl 6.3 gm (0.02 mol) of 1-(2-cyano-4-chlorophenoxy)- 2-hydroxy-3-tert.-butylamino propane hydrochloride were dissolved in 100 ml of methanol containing 10 ml of NH; and the mixture was hydrogenated under normal pressure at 20C over Raney-nickel. After separation of the catalyst, the solvent was distilled off in vacuo, and the residue was admixed with ether and water. After an addition of a small amount of NaOH, the aqueous phase was separated and the organic phase was washed with water and dried overMgSO After distilling off the ether, a solid residue remained which was recrystallized from ethyl acetate with an addition of petroleum ether to obtain l-(2-aminomethyl-4- chlorphenoxy)-2-hydroxy-3-tert.-butylamino propane. The base was dissolved in ethanol and ethereal HCl was added thereto. The precipitated crystals of the hydrochloride of the base were isolated to obtain 3.1 gm of the hydrochloride having a melting point of 1 18 120 C.

EXAMPLE V1 Using the procedure of Example V, l-(2-methoxy-4- cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane hydrochloride was hydrogenated to form 1-(2- methoxy-4-aminomethylphenoxy)-2-hydroxy-3-tert.- butylamino propane dihydrochloride having a melting point of 235 238 C.

EXAMPLE VII the procedure V, cyanophenoxy) -2-hydroxy-3-tert.-butylamino propane hydrochloride was hydrogenated to obtain l-(2- aminomethyl-phenoxy)-2-hydroxy-3-tert.-butylamino propane dihydrochloride having a melting point of 220 Using of Example 1-(2- EXAMPLE V111 Using the procedure of Example 1V, l-(2-methoxycarbonylphenoxy)-2,3-epoxy-propane was reacted with tert.-butylamine to form l-(Z- methoxycarbonylphenoxy)-2-hydroxy-3-tert.- butylamino propane hydrochloride having a melting point of 144 146 C.

EXAMPLE lX By saponification of methoxycarbonylphenoxy)-2-hydroxy-3-tert.- butylamino propane with sodium hydroxide, there was obtained l-(Z-hydroxycarbonylphenoxy)-2-hydroxy-3- tert.-butylamino propane hydrochloride having a melting point of 138 140 C.

EXAMPLE X Using the procedure of Example IV, tert.-butylamine and l-(2-methoxy-S-cyanophenoxy)-2,3-epoxy propane were reacted to obtain l-(2-methoxy-5- cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 149 152 C.

EXAMPLE X1 EXAMPLE X11 l-(4-methoxycarbonylphenoxy)-2-hydroxy-3-tert.- butylamino propane was chlorinated analogous to Example to obtain 1-(2-chloro-4- methoxycarbonylphenoxy)-2-hydroxy-3-tert.-

butylamino propane hydrochloride having a melting point of 208 210 C.

EXAMPLE X111 Preparation of l-(2-cyanophenoxy)-2-hydroxy-3-tert.- butylamino propane. HCl

15 gm (0.085 mol) of l-(2-cyanophenoxy)-2,3- epoxy propane were dissolved in 100 ml of ethanol and 18.6 gm (0.255 mol) of tert.-butylamine were added thereto. After standing for l hour at room temperature, the solution was heated at 60 C for 2 hours after which the volatile constitutents were distilled off in vacuo. The residue was digested with dilute HCl, and the insoluble constituents were vacuum filtered off. Then the filtrate was made alkaline with NaOH and the precipitating base was. taken up in ether. After the ether solution had been dried over MgSO the ether was distilled off and the residue was dissolved in ethanol and by addition of ethereal l-lCl, the hydrochloride was precipitated therefrom in crystalline form which after recrystallization from ethanol with an addition of ether gave 9.8 gm of 1-( 2-cyanophenoxy)-2-hydroxy-3- tert.-butylamino propane hydrochloride having a melting point of 163 165 C.

EXAMPLE XlV Preparation of l-(4-cyanophenoxy)-2-hydroxy-3-tert.- butylamino propane HCl 5.7 gm (0.02 mol) of 3-tert.-butyl-5-(4- cyanophenoxymethyl)-oxazolidinone-(2) were dissolved in 50 ml of ethanol. After addition of a solution of 10 gm of potassium hydroxide in 15 ml of water, the solution was refluxed for 2 hours and then the ethanol was distilled off in vacuo, and the residue was extracted with ether. The ethereal phase was separated, dried over MgSO and the MgSO, was filtered off. After concentration of the ether solution, the solid raw base was recrystallized from ethyl acetate to obtain a product having a melting point of C. After dissolving the crystalline base in ethanol, ethereal hydrochloric acid was added and the solid was isolated and again recrystallized from ethanol/ether to obtain 1.9 gm of l-(4-cyanophenoxy)-2-hydroxy-3-tert.- butylamino propane hydrochloride having a melting point of 187 189 C.

EXAMPLE XV Preparation of l-(3-cyanophenoxy)-2-hydroxy-3-tert.- butylamino-Z-propane oxalate 9.6 gm (0.05 mol) of l-(3-cyanophenoxy)-2- hydroxy-3-amino propane were dissolved in 40 ml of dimethylformamide and 100 ml of tetrahydrofuran and 4.2 gm (0.05 mol) of pulverized sodium bicarbonate were added thereto. Then, 6.9 gm (0.05 mol) of tert.- butylbromide were added and the mixture was refluxed for 24 hours. After the mixture had been cooled, the inorganic solid was filtered off and the solvent mixture was distilled off in vacuo. The residue was dissolved by heating in ethyl acetate and the insoluble inorganic portions were vacuum filtered off and the filtrate was admixed with petroleum ether. The base precipitated in solid form and was isolated and recrystallized from ethyl acetate with an addition of petroleum ether to obtain l-(3-cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane having a melting point of 108 110 C.

After having been dissolved in ether, the said product was admixed with an ethereal oxalic acid solution whereby the oxalate precipitated in amorphous form. It was isolated, dissolved in a small amount of ethanol and slowly ether was added thereto. 2.7 gm of the oxalate salt occured in colorless crystalline form and after being vacuum filtered and dried. melted at 154 157 C under decomposition.

EXAMPLE XVI l-(2-nitro-4-chlorophenoxy)-2-hydroxy-3-tert.- butylamino propane was hydrogenated in the presence of Raney-nickel in methanol to obtain 1-(2-amino-4- chlorophenoxy)-2-hydroxy-3-tert.-butylamino propane dihydrochloride having a melting point of 260 262 C.

Using the same procedure of hydrogenation, there were obtained 1-(2-amino-4-fluorophenoxy)-2- hydroxy-3-tert.-butylamino-propane dihydrochloride and l-(2-nitro-4-bromophenoxy)-2-hydroxy-3-tert.- butylamino propane dihydrochloride.

EXAMPLE XVII Preparation of 1-(2,4-dichloro-3-aminophenoxy)-2- hydroxy-3-tert.-butylaminc-propane I-ICl 8.05 gm of 1-(3-nitrophenoxy)-2-hydroxy-3-tert.- butylamino-propane were dissolved in 100 cc of concentrated hydrochloric acid with stirring and the resulting solution was heated to 45 C. Then, 11.3 gm (0.1 mol) of 30 percent hydrogen peroxide solution were added dropwise while holding the temperature between 50 and 60 C with stirring. After 30 minutes, an oil separated and excess hydrochloric acid was distilled off in vacuo. The residue was taken up in water and the mixture was made alkaline with sodium hydroxide. The resulting free base precipitated as an oil and was dissolved in ethyl acetate. The said solution was washed with water, dried and evaporated to dryness to obtain 9.2 gm (0.0273 mol) of l-(2.4-dichloro-3- nitrophenoxy)-2-hydroxy-3-tert.-butylamino-propane.

The 9.2 gm of the said base were dissolved in 150 cc of methanol and the said base was hydrogenated in the presence of a Raney-nickel catalyst at room temperature and normal pressure until the theoretical amount of hydrogen (1240 cc) was adsorbed (2 /2 hours). The catalyst was then removed by suction filtration and the solvent was distilled off in vacuo. The residue was dissolved in ethanol and the resulting solution was acidified with etherified hydrochloric acid and extracted with ether. After standing in the cold, the dihydrochloride of l-(2,4-dichloro-3-amino-phenoxy)-2-hydroxy-3- tert.-butylamino-propane crystallized out. After recrystallization twice from acetonitrile, there was obtained 2.5 gm ofthe dihydrochloride melting at 166- 169 C.

PHARMACEUTICAL EXAMPLES EXAMPLE A TABLETS 2. 1-( 2-cyano-3mcthyl-phcnoxy)-2- hydroxy-3-tert.-butylamino propanc hydrochloride 2.6-bis-( dicthanolamino)-4-8- PHARMACEUTICAL EXAMPLES-Continued EXAMPLE A TABLETS d ipipcridino-pyrimido- 5 .4-d]

-pyrimidinc 75.0 lactose 164.0 corn starch 194.0 colloidal silicic acid 14.0 polyvinylpyrrolidone 6.0 magnesium stearate 2.0 soluble starch 10.0

The individual components are intensively admixed and the mixture is granulated in the usual manner. The granulate is compressed into 1,000 tablets of 500 mg, 445 or 515 mg.

EXAMPLE B GELATIN CAPSULES mg. 1-( 2-cyano-4-chlorophenoxy )-2- hydroxy-3-tert.-butylamino propane maleinate 25.0 corn starch 175.0

The ingredients are intensively admixed and 200 mg portions of the mixtures are filled into gelatin capsules of suitable size. Each capsule contains 25 mg of the optically active substance.

EXAMPLE C INJECTABLE SOLUTION parts l-( 2- methyl-4-cyanophenoxy )-2- hydroxy-3-tert.-butylamino-propane hydrochloride 2.5 sodium salt of EDTA 0.2 (cthylenc-diaminctetraacetic acid) distilled water ad. 100.0

Preparation The active substance and the EDTA-salt were dissolved in sufficient water and distilled water to the desired volume was added. The solution was filtered free of suspended particles and filled into 1 cm-ampules under aseptic conditions. Then, the ampules were sterilized and sealed so that each of these ampules contained 25 mg of active substance.

EXAMPLE D SUSTAINED RELEASE TABLETS The active substance, the carboxymethylcellulose and the stearic acid are intensively admixed and the mixture is granulated in the usual manner, a solution of the cellulose acetate phthalate in 200 ml of a mixture of ethanol and ethylacetate is used for this purpose.

The granulate is then compressed into 380 mg kernels, which in the usual manner coated with a sugar containing percent solution of polyvinylpyrrolidone in water. Each tablet contains 25 mg of active ingredients.

PHARMACOLOGlCAL DATA The compounds of the invention were tested for B-adrenergic blocking activity in adult laboratory guinea pigs under urethane anaesthesia.

The bradycardia activity of the compounds was determined by administering the test compounds by intravenous injection at 5 progressively increasing dosages (0.1 mg/kg, 0.3 mg/kg, 1 mg/kg, 3 mg/kg and mg/kg for each compound) to 4 animals per compound and ascertaining the decrease of the basic frequency of the heart beat by means of an electrical recorder.

After each determination of the decrease of the basic frequency, l,u./kg of isoproterenol a (isopropylaminomethyl) protocatechuyl alcohol] was administered to the same animal by intravenous injection, and the maximum frequency change was determined.

The results of both determinations (bradycardia activity and isoproterenol antagonistic activity) were plotted as a doseactivity curve, and the curve for each compound was compared with a corresponding curve for the standard control compound dichlorisoproterenol (DCI), a known effective ,B-adrenergic blocking agent. The following results were obtained.

ox Z-hydroxy-3-tert.-butylumino-propanc 2 HCl Various modifications of the compositions and method of the invention may be made without departing from the spirit or scope thereof and it is to be understood that the invention is to be limited only as defined in the appended claims.

We claim:

I. A composition having bradycardia and isoproterenol antagonistic activity comprising a small but effective amount of at least one active compound selected from the group consisting of racemates of l-phenoxy -2-hydroxy-3-tert.-butyl-amino propanes of the formula wherein R is cyano; R, is hydrogen and R is selected from the group consisting of hydrogen. chlorine and alkyl and alkoxy of one to four carbon atoms, their optically active isomers and theirnon-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers and a major amount of a pharmaceutical carrier.

2. A composition of claim 1 wherein the amount of active ingredient is l to 300 mg.

3. A composition of claim 1 wherein R, is hydrogen.

4. A compositionof claim 1 wherein the active compound is l-(2-cyano-3-methyl-phenoxy)-2-hydroxy-3- tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

5. A composition of claim 1 wherein the active compound is l-(2-cyano-4-chlorophenoxy)-2-hydroxy-3- ten-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

6. A composition of claim 1 wherein the active compound is l-(2-methyl-4-cyanophenoxy)-2-hydroxy-3- tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

7. A composition of claim 1 wherein the active compound is l-(2-methoxy-4-cyanophenoxy)-2-hydroxy-3- tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

8. A composition of claim 1 wherein the active compound is l-(2-methoxy-5-cyanophenoxy)-2-hydroxy-3- tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

9. A composition of claim 1 wherein the active compound is l-(2-cyano-phenoxy)-2-hydroxy-3-tert.- butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

10. A composition of claim 1 wherein the active compound is 1-(4-cyano-phenoxy)-2-hydroxy-3-tert.- butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

IL A composition of claim 1 wherein the active compound is l-(3-cyano-phenoxy)-2-hydroxy-3-tert.- butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

12. A method producing bradycardia and suppressing tachycardiac effects of N-isopropylnoradrenaline in warm-blooded animals which comprises administering to warm-blooded animals a safe and effective amount of at least one compound selected from the group consisting of racemates of 1-phenoxy-3-hydroxy-3-tert.- butylamino propanes of the formula wherein R is cyano; R is hydrogen and R is selected from the group consisting of hydrogen, chlorine and alkyl and alkoxy of one to four carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers.

13. The method of claim 12 wherein the active compound is l-(2-cyanophenoxy)-2-hydroxy-3-tert.- butylamino propane or its non-toxic, pharmaceutically acceptable acid addition salts. 

1. A COMPOSITION HAVING BRADYCARDIA AND ISOPROTERENOL ANTAGONISTIC ACTIVITY COMPRISING A SMALL BUT EFFECTIVE AMOUNT OF AT LEAST ONE ACTIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF RACEMATES OF 1-PHENOXY-2-HYDROXY-3-TERT-BUTYLAMINO PROPANES OF THE FORMULA
 2. A composition of claim 1 wherein the amount of active ingredient is 1 to 300 mg.
 3. A composition of claim 1 wherein R1 is hydrogen.
 4. A composition of claim 1 wherein the active compound is 1-(2-cyano-3-methyl-phenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 5. A composition of claim 1 wherein the active compound is 1-(2-cyano-4-chlorophenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 6. A composition of claim 1 wherein the active compound is 1-(2-methyl-4-cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 7. A composition of claim 1 wherein the active compound is 1-(2-methoxy-4-cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 8. A composition of claim 1 wherein the active compound is 1-(2-methoxy-5-cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 9. A composition of claim 1 wherein the active compound is 1-(2-cyano-phenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 10. A composition of claim 1 wherein the active compound is 1-(4-cyano-phenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 11. A composition of claim 1 wherein the active compound is 1-(3-cyano-phenoxy)-2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.
 12. A method producing bradycardia and suppressing tachycardiac effects of N-isopropylnoradrenaline in warm-blooded animals which comprises administEring to warm-blooded animals a safe and effective amount of at least one compound selected from the group consisting of racemates of 1-phenoxy-3-hydroxy-3-tert.-butylamino propanes of the formula
 13. The method of claim 12 wherein the active compound is 1-(2-cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane or its non-toxic, pharmaceutically acceptable acid addition salts. 